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From 26653f89373a3439d6dba73c660d00116c0dbbc0 Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Mon, 27 Jan 2014 16:07:42 +0100
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Subject: [PATCH 20/22] pc: Disable RDTSCP unconditionally on rhel6.* machine-types
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RH-Author: Eduardo Habkost <ehabkost@redhat.com>
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Message-id: <1390838863-11030-2-git-send-email-ehabkost@redhat.com>
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Patchwork-id: 56960
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O-Subject: [RHEL7 qemu-kvm PATCH 1/2] pc: Disable RDTSCP unconditionally on rhel6.* machine-types
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Bugzilla: 918907
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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Bugzilla: 918907
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Upstream status: not applicable
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Brew scratch build: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=6953316
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The RHEL-6 kernel didn't support exposing RDTSCP at all, so we need to
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disable RDTSCP on all CPU models.
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The previous rhel6.5.0 compat code wasn't complete, because Opteron_G4
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and Opteron_G5 were not being changed.
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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---
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hw/i386/pc_piix.c | 16 +++-------------
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1 file changed, 3 insertions(+), 13 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/i386/pc_piix.c | 16 +++-------------
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1 files changed, 3 insertions(+), 13 deletions(-)
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diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
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index 641f3d9..b918f69 100644
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--- a/hw/i386/pc_piix.c
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+++ b/hw/i386/pc_piix.c
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@@ -906,10 +906,9 @@ static void pc_compat_rhel650(QEMUMachineInitArgs *args)
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CPUID_EXT2_CX8 | CPUID_EXT2_MCE | CPUID_EXT2_PAE | CPUID_EXT2_MSR |
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CPUID_EXT2_TSC | CPUID_EXT2_PSE | CPUID_EXT2_DE | CPUID_EXT2_FPU,
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0);
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- x86_cpu_compat_set_features("SandyBridge", FEAT_8000_0001_EDX,
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- 0, CPUID_EXT2_RDTSCP);
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- x86_cpu_compat_set_features("Haswell", FEAT_8000_0001_EDX,
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- 0, CPUID_EXT2_RDTSCP);
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+
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+ /* RHEL-6 kernel never supported exposing RDTSCP */
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+ x86_cpu_compat_set_features(NULL, FEAT_8000_0001_EDX, 0, CPUID_EXT2_RDTSCP);
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x86_cpu_compat_set_features("Opteron_G1", FEAT_1_ECX, CPUID_EXT_X2APIC, 0);
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x86_cpu_compat_set_features("Opteron_G2", FEAT_1_ECX, CPUID_EXT_X2APIC, 0);
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@@ -917,15 +916,6 @@ static void pc_compat_rhel650(QEMUMachineInitArgs *args)
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x86_cpu_compat_set_features("Opteron_G4", FEAT_1_ECX, 0, CPUID_EXT_X2APIC);
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x86_cpu_compat_set_features("Opteron_G5", FEAT_1_ECX, 0, CPUID_EXT_X2APIC);
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- x86_cpu_compat_set_features("phenom", FEAT_8000_0001_EDX,
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- 0, CPUID_EXT2_RDTSCP);
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- x86_cpu_compat_set_features("Opteron_G1", FEAT_8000_0001_EDX,
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- 0, CPUID_EXT2_RDTSCP);
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- x86_cpu_compat_set_features("Opteron_G2", FEAT_8000_0001_EDX,
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- 0, CPUID_EXT2_RDTSCP);
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- x86_cpu_compat_set_features("Opteron_G3", FEAT_8000_0001_EDX,
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- 0, CPUID_EXT2_RDTSCP);
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-
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/* RHEL-6 had 3dnow & 3dnowext unconditionally disabled on all models */
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x86_cpu_compat_set_features(NULL, FEAT_8000_0001_EDX, 0,
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CPUID_EXT2_3DNOW | CPUID_EXT2_3DNOWEXT);
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--
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1.7.1
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